Sudden bleeding after a week of no bleeding after painless abortion may be caused by normal phenomenon, intrauterine residue, uterine infection, etc., and need to be targeted to take general treatment, medication, purging treatment and so on. 1. Normal phenomenon: in the first few days after the painless abortion surgery may be due to bed rest, resulting in blood accumulation in the uterine cavity is not discharged in a timely manner, when the appropriate activities out of bed, the accumulation of fluid in the uterine cavity will be discharged, which is a normal phenomenon, do not need special treatment. 2. Intrauterine residue: may be due to painless abortion is not clean, resulting in intrauterine residue caused by the phenomenon, generally need to go to the hospital to do the purging treatment, to avoid causing serious infection. 3. uterine cavity infection: may be secondary to infection after abortion often leads to vaginal bleeding and other symptoms, need to actively take anti-infection treatment, such as oral metronidazole, amoxicillin and other antibiotic drugs. Painless abortion after not bleeding a week after the sudden bleeding may also be caused by other reasons, if the amount of bleeding is relatively large or accompanied by other symptoms of discomfort, you should consult a doctor to find out the cause.